Regearing your 4x4s axles is the easiest way to compensate for larger tires, and getting this done properly can get costly, especially because it requires specialized knowledge and tools. At this point, it might be a good idea to add lockers. It’s also a good time to replace all of the bearings associated with the axle’s ring-and-pinions since there may be wear and damage to these seldom-serviced parts. And yes, that means in a 4x4, both front and rear axles must be regeared. The parts and their associated costs racks up quickly.